[Vwdiesel] PCV operation;blowby and runaway

[The President]

Shawn and Andrew I am impressed...

This surely is the "Thinking [and doing] Man's Forum"

I expected people to jump in and  say what's the Limey talkin' about? 
Dohhh...

The semi blocked cam cover grating may be quite crucial:
If the sump pressurises beyond a few psi then overcoming gravity may be easy 
especially if the pipe is nearly full. Won't the area near the intake side 
turbo bearing be atmospheric at tick over and at vaccuum with turbo fins 
scavenging enough air centrifugally to supply say 10 psi. Indeed maybe a 
'syphoning' effect Andrew (;o)...

Mark

>From: "Shawn Wright" <swright at zuiko.sls.bc.ca>
>To: vwdiesel at vwfans.com
>Subject: Re: [Vwdiesel] PCV operation;blowby and runaway
>Date: Thu, 25 May 2006 21:55:33 -0700
>
>On 25 May 2006 at 22:28, The President <quantum-man at hotmail.co.uk> wrote:
>
> > Brian
> > thanks for translating (Some folks don't like talking to foreigners ;o)
> >
> > Surely operation of this valve is easily determined...
> > It either operates from vacuum or (blocked airfilter/over revving) or
> > excessive blowby pressure. Check with an airhose or a vaccum cleaner... 
>Or
> > neither Doesn't blowby decrease with rpm anyway. It definitely does in 
>the lower
> > speedswhen rising from idle... If the PCV does restrict air flow; then 
>doesn't
> > this cause blowby (oil spillage in the turbo)? Even runaway in a slack 
>turbo?
>
>The TD PCV 'valve' appears to be just another way to attempt to scavenge 
>the oil mist - the
>flow goes up into the 3" round disc, then must flow out through the 
>horizontal exit through a
>small 1/2" or so hole. Any oil which splatters inside the disc is 
>encouraged to run back into
>the engine. I can see no sign of a valve in mine. I suppose a restricted 
>PCV could make a
>poor turbo drain back up enough to blow oil past the seals. Certainly a 
>plugged turbo drain
>will do that, as I found out... it didn't run away though, but might have 
>if I didn't catch it I
>guess.
>
>
>Shawn Wright
>http://members.shaw.ca/vwdiesels
>'88 Westy 1.6TD 5 speed
>'85 Jetta Diesel 1.6NA
>
>_______________________________________________
>Vwdiesel mailing list
>Vwdiesel at vwfans.com
>http://www.audifans.com/mailman/listinfo/vwdiesel

_________________________________________________________________
Are you using the latest version of MSN Messenger? Download MSN Messenger 
7.5 today! http://join.msn.com/messenger/overview